| City | Area Code | Dialing Code |
|---|---|---|
| Affton | 314 | +1 314 |
| Ballwin | 636 | +1 636 |
| Belton | 816 | +1 816 |
| Blue Springs | 816 | +1 816 |
| Cape Girardeau | 573 | +1 573 |
| Chesterfield | 636 | +1 636 |
| Columbia | 573 | +1 573 |
| Ferguson | 314 | +1 314 |
| Florissant | 314 | +1 314 |
| Gladstone | 816 | +1 816 |
| Grandview | 816 | +1 816 |
| Hazelwood | 314 | +1 314 |
| Independence | 816 | +1 816 |
| Jefferson City | 573 | +1 573 |
| Joplin | 417 | +1 417 |
| Kansas City | 816 | +1 816 |
| Kirkwood | 314 | +1 314 |
| Lee's Summit | 816 | +1 816 |
| Liberty | 816 | +1 816 |
| Maryland Heights | 314 | +1 314 |
| Mehlville | 314 | +1 314 |
| O'Fallon | 636 | +1 636 |
| Oakville | 314 | +1 314 |
| Raytown | 816 | +1 816 |
| Saint Charles | 636 | +1 636 |
| Saint Joseph | 816 | +1 816 |
| Saint Peters | 636 | +1 636 |
| Sedalia | 660 | +1 660 |
| Spanish Lake | 314 | +1 314 |
| Springfield | 417 | +1 417 |
| St. Louis | 314 | +1 314 |
| University City | 314 | +1 314 |
| Webster Groves | 314 | +1 314 |
| Wildwood | 636 | +1 636 |